CVE-2022-49680: ARM: exynos: Fix refcount leak in exynos_map_pmu

CVE-2022-49680: ARM: exynos: Fix refcount leak in exynos_map_pmu

[Greg Kroah-Hartman]

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

ARM: exynos: Fix refcount leak in exynos_map_pmu

of_find_matching_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.
of_node_put() checks null pointer.

The Linux kernel CVE team has assigned CVE-2022-49680 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 4.9.321 with commit 545ae5cbae839ce39bfe09828e413f1c916082de
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 4.14.286 with commit 31d09571bb071c20f6bdc0bb7ac1ef8dd2987c04
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 4.19.250 with commit 7571bcecf01b69f0d3ec60ca41ce5d4c75411a4a
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 5.4.202 with commit f9b77a52937582a5b99a5a07e4ef1e2f48f87347
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 5.10.127 with commit 68f28d52e6cbab8dcfa249cac4356d1d0573e868
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 5.15.51 with commit d23f76018e17618559da9eea179d137362023f95
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 5.18.8 with commit fc354856e9fad9cd36e2ad28f9da70716025055a
	Issue introduced in 3.17 with commit fce9e5bb25264153f9f002eada41757118d25ba9 and fixed in 5.19 with commit c4c79525042a4a7df96b73477feaf232fe44ae81

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49680
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	arch/arm/mach-exynos/exynos.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/545ae5cbae839ce39bfe09828e413f1c916082de
	https://git.kernel.org/stable/c/31d09571bb071c20f6bdc0bb7ac1ef8dd2987c04
	https://git.kernel.org/stable/c/7571bcecf01b69f0d3ec60ca41ce5d4c75411a4a
	https://git.kernel.org/stable/c/f9b77a52937582a5b99a5a07e4ef1e2f48f87347
	https://git.kernel.org/stable/c/68f28d52e6cbab8dcfa249cac4356d1d0573e868
	https://git.kernel.org/stable/c/d23f76018e17618559da9eea179d137362023f95
	https://git.kernel.org/stable/c/fc354856e9fad9cd36e2ad28f9da70716025055a
	https://git.kernel.org/stable/c/c4c79525042a4a7df96b73477feaf232fe44ae81